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<div class="header">
  <div class="headertitle"><div class="title">PC8250.cpp</div></div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/*</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment">  Created by Fabrizio Di Vittorio (fdivitto2013@gmail.com) - &lt;http://www.fabgl.com&gt;</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment">  Copyright (c) 2019-2022 Fabrizio Di Vittorio.</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment">  All rights reserved.</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"></span> </div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"></span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment">* Please contact fdivitto2013@gmail.com if you need a commercial license.</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"></span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"></span> </div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment">* This library and related software is available under GPL v3.</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"></span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment">  FabGL is free software: you can redistribute it and/or modify</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment">  it under the terms of the GNU General Public License as published by</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment">  the Free Software Foundation, either version 3 of the License, or</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment">  (at your option) any later version.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"></span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment">  FabGL is distributed in the hope that it will be useful,</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">  but WITHOUT ANY WARRANTY; without even the implied warranty of</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment">  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span><span class="comment">  GNU General Public License for more details.</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="comment"></span> </div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="comment">  You should have received a copy of the GNU General Public License</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="comment">  along with FabGL.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="comment"> */</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span> </div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span> </div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span> </div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="preprocessor">#include &quot;<a class="code" href="_p_c8250_8h.html">PC8250.h</a>&quot;</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span> </div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="preprocessor">#define PC8250_IER_RX_INT     0x01</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="preprocessor">#define PC8250_IER_TX_INT     0x02</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="preprocessor">#define PC8250_IER_LINE_INT   0x04</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="preprocessor">#define PC8250_IER_MODEM_INT  0x08</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span> </div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="preprocessor">#define PC8250_LCR_MBITSTOP   0x04</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="preprocessor">#define PC8250_LCR_PARITYEN   0x08</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="preprocessor">#define PC8250_LCR_PARITYEVEN 0x10</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="preprocessor">#define PC8250_LCR_SENDBREAK  0x40</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="preprocessor">#define PC8250_LCR_DLAB       0x80</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span> </div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="preprocessor">#define PC8250_MCR_DTR        0x01</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="preprocessor">#define PC8250_MCR_RTS        0x02</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="preprocessor">#define PC8250_MCR_OUT1       0x04</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="preprocessor">#define PC8250_MCR_OUT2       0x08</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="preprocessor">#define PC8250_MCR_LOOPBACK   0x10</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span> </div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span> </div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="preprocessor">#define PC8250_LSR_DR         0x01</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="preprocessor">#define PC8250_LSR_OE         0x02</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="preprocessor">#define PC8250_LSR_PE         0x04</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="preprocessor">#define PC8250_LSR_FE         0x08</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="preprocessor">#define PC8250_LSR_BI         0x10</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="preprocessor">#define PC8250_LSR_THRE       0x20</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="preprocessor">#define PC8250_LSR_TEMT       0x40</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span> </div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span> </div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="preprocessor">#define PC8250_MSR_DCTS       0x01</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="preprocessor">#define PC8250_MSR_DDSR       0x02</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="preprocessor">#define PC8250_MSR_TERI       0x04</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="preprocessor">#define PC8250_MSR_DDCD       0x08</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="preprocessor">#define PC8250_MSR_CTS        0x10</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="preprocessor">#define PC8250_MSR_DSR        0x20</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="preprocessor">#define PC8250_MSR_RI         0x40</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="preprocessor">#define PC8250_MSR_DCD        0x80</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span> </div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span> </div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="preprocessor">#define PC8250_DEBUG 0</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span> </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span> </div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="keyword">namespace </span>fabgl {</div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span> </div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>PC8250::PC8250(<span class="keywordtype">int</span> freq)</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>  : m_freq(freq),</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>    m_serialPort(nullptr)</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>{</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span>}</div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span> </div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span> </div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>PC8250::~PC8250()</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>{</div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>}</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span> </div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span> </div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="keywordtype">void</span> PC8250::reset()</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>{</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>  m_DLL       = 0;</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>  m_DLM       = 0;</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>  m_trigs     = 0;</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>  m_IER       = 0;</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>  m_LCR       = 0;</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>  m_MCR       = 0;</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>  m_LSR       = PC8250_LSR_THRE | PC8250_LSR_TEMT;</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>  m_MSR       = 0;</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>  m_SCR       = 0;</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>  m_IIR       = 1;</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>  m_overrun   = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>  m_dataReady = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>}</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span> </div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span> </div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="keywordtype">void</span> PC8250::setSerialPort(SerialPort * value)</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>{</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>  m_serialPort = value;</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>  m_serialPort-&gt;setCallbacks(<span class="keyword">this</span>, rxReadyCallback, rxCallback);</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>  m_serialPort-&gt;setup(2, 115200, 8, <span class="charliteral">&#39;N&#39;</span>, 1, <a class="code hl_enumvalue" href="group___enumerations_gae88006c219f95bae663fe0f2a2561dd7.html#ggae88006c219f95bae663fe0f2a2561dd7a6adf97f83acf6453d4a6a4b1070f3754">fabgl::FlowControl::None</a>);</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span>}</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="keywordtype">void</span> PC8250::rxCallback(<span class="keywordtype">void</span> * args, uint8_t value, <span class="keywordtype">bool</span> fromISR)</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>{</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>  <span class="keyword">auto</span> obj = (PC8250 *) args;</div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>  </div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>  obj-&gt;m_dataRecv = value;</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  <span class="keywordflow">if</span> (obj-&gt;m_dataReady)</div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>    obj-&gt;m_overrun = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>  obj-&gt;m_dataReady = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>}</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span> </div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span> </div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="keywordtype">bool</span> PC8250::rxReadyCallback(<span class="keywordtype">void</span> * args, <span class="keywordtype">bool</span> fromISR)</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>{</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>}</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span> </div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span> </div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>uint8_t PC8250::read(<span class="keywordtype">int</span> reg)</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>{</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>  uint8_t ret = 0;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>  </div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>  <span class="keywordflow">switch</span>(reg &amp; 7) {</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>  </div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>    <span class="comment">// DLAB = 0 : Receiver Buffer Register (RBR)</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>    <span class="comment">// DLAB = 1 : Divisor Latch LSB Register (DLL)</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>    <span class="keywordflow">case</span> 0:</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>      <span class="keywordflow">if</span> (m_LCR &amp; PC8250_LCR_DLAB) {</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>      </div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>        <span class="comment">// Divisor Latch LSB Register (DLL)</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span>        ret = m_DLL;</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>        </div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>        printf(<span class="stringliteral">&quot;RD DLL %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>        </div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>      </div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>        <span class="comment">// Receiver Buffer Register (RBR)</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>        ret = m_MCR &amp; PC8250_MCR_LOOPBACK ? m_THR : m_dataRecv;</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>        m_dataReady = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>        m_LSR      &amp;= ~PC8250_LSR_DR;       <span class="comment">// reset DR flag</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>        m_trigs    &amp;= ~PC8250_IER_RX_INT;   <span class="comment">// reset interrupt triggered flag</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>        m_IIR       = 1;</div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>        </div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>        printf(<span class="stringliteral">&quot;RD RBR %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>        </div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>      }</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>      </div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span>    <span class="comment">// DLAB = 0 : Interrupt Enable Register (IER)</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span>    <span class="comment">// DLAB = 1 : Divisor Latch MSB Register (DLM)</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>    <span class="keywordflow">case</span> 1:</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span>      <span class="keywordflow">if</span> (m_LCR &amp; PC8250_LCR_DLAB) {</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span>      </div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span>        <span class="comment">// Divisor Latch MSB Register (DLM)</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span>        ret = m_DLM;</div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span>        </div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span>        printf(<span class="stringliteral">&quot;RD DLM %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span>        </div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span>      </div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span>        <span class="comment">// Interrupt Enable Register (IER)</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>        ret = m_IER;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span>        </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span>        printf(<span class="stringliteral">&quot;RD IER %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span>        </div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span>      }</div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span>      </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span>    <span class="comment">// Interrupt Identification Register (IIR)</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span>    <span class="keywordflow">case</span> 2:</div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span>      <span class="keywordflow">if</span> (m_IIR == 1) {</div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span>        <span class="keywordflow">if</span> (m_trigs &amp; PC8250_IER_LINE_INT)</div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span>          m_IIR = 0b110;</div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span>        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_trigs &amp; PC8250_IER_RX_INT)</div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span>          m_IIR = 0b100;</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span>        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_trigs &amp; PC8250_IER_TX_INT) {</div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span>          m_IIR = 0b010;</div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span>          m_trigs &amp;= ~PC8250_IER_TX_INT;</div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span>        } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m_trigs &amp; PC8250_IER_MODEM_INT)</div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span>          m_IIR = 0b000;</div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span>      } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (!m_trigs)</div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span>        m_IIR = 1;</div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span>        </div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span>      ret = m_IIR;</div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span>        </div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span>      printf(<span class="stringliteral">&quot;RD IIR %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span>      </div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span>        </div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span>    <span class="comment">// Line Control Register (LCR)</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span>    <span class="keywordflow">case</span> 3:</div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span>      ret = m_LCR;</div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span>      </div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span>      printf(<span class="stringliteral">&quot;RD LCR %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span>      </div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span>      </div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span>    <span class="comment">// MODEM Control Register (MCR)</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span>    <span class="keywordflow">case</span> 4:</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span>      ret = m_MCR;</div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span>      </div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span>      printf(<span class="stringliteral">&quot;RD MCR %02X (%s %s %s %s %s)\n&quot;</span>, ret, ret &amp; PC8250_MCR_DTR ? <span class="stringliteral">&quot;DTR&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MCR_RTS ? <span class="stringliteral">&quot;RTS&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MCR_OUT1 ? <span class="stringliteral">&quot;OUT1(RI)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MCR_OUT2 ? <span class="stringliteral">&quot;OUT2(DCD)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MCR_LOOPBACK ? <span class="stringliteral">&quot;LOOPBACK&quot;</span> : <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span>      </div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span>      </div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>    <span class="comment">// Line Status Register (LSR)</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span>    <span class="keywordflow">case</span> 5:</div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span>      <span class="keywordflow">if</span> ((m_MCR &amp; PC8250_MCR_LOOPBACK) == 0) {</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>        checkByteReceived();</div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span>        checkOverflowError();</div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span>        checkParityError();</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span>        checkFramingError();</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span>        checkBreakDetected();</div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span>      }</div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span>      ret = m_LSR;</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span>      <span class="comment">// reset OE, PE, FE, BI flags</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span>      m_LSR  &amp;= ~(PC8250_LSR_OE | PC8250_LSR_PE | PC8250_LSR_FE | PC8250_LSR_BI);</div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span>      <span class="comment">// reset line interrupt triggered flag</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span>      m_trigs &amp;= ~PC8250_IER_LINE_INT;</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span>      m_IIR    = 1;</div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span>      </div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span>      printf(<span class="stringliteral">&quot;RD LSR %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span>      </div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span>      </div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span>    <span class="comment">// MODEM Status Register (MSR)</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span>    <span class="keywordflow">case</span> 6:</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span>      checkCTSChanged();</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span>      checkDSRChanged();</div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span>      checkRIChangeLow();</div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span>      checkDCDChanged();</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>      ret = m_MSR;</div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span>      <span class="comment">// reset DCTS, DDSR, TERI, DDCD flags</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>      m_MSR   &amp;= ~(PC8250_MSR_DCTS | PC8250_MSR_DDSR | PC8250_MSR_TERI | PC8250_MSR_DDCD);</div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span>      <span class="comment">// reset interrupt triggered flag</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span>      m_trigs &amp;= ~PC8250_IER_MODEM_INT;</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span>      m_IIR    = 1;</div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span>      </div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span>      printf(<span class="stringliteral">&quot;RD MSR %02X (%s %s %s %s %s %s %s %s)\n&quot;</span>, ret, ret &amp; PC8250_MSR_DCTS ? <span class="stringliteral">&quot;DCTS&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_DDSR ? <span class="stringliteral">&quot;DDSR&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_TERI ? <span class="stringliteral">&quot;TERI&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_DDCD ? <span class="stringliteral">&quot;DDCD&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_CTS ? <span class="stringliteral">&quot;CTS&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_DSR ? <span class="stringliteral">&quot;DSR&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_RI ? <span class="stringliteral">&quot;RI(OUT1)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, ret &amp; PC8250_MSR_DCD ? <span class="stringliteral">&quot;DCD(OUT2)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span>      </div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>      </div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span>    <span class="comment">// Scratch Register</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span>    <span class="keywordflow">case</span> 7:</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span>      ret = m_SCR;</div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span>      </div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span>      printf(<span class="stringliteral">&quot;RD SCR %02X\n&quot;</span>, ret);</div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span>      </div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span>  </div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span>  }</div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span>  </div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span>}</div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span> </div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span> </div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="keywordtype">void</span> PC8250::write(<span class="keywordtype">int</span> reg, uint8_t value)</div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span>{</div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>  <span class="keywordflow">switch</span>(reg &amp; 7) {</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span>  </div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span>    <span class="comment">// DLAB = 0 : Transmitter Holding Register (THR)</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span>    <span class="comment">// DLAB = 1 : Divisor Latch LSB Register (DLL)</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span>    <span class="keywordflow">case</span> 0:</div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span>      <span class="keywordflow">if</span> (m_LCR &amp; PC8250_LCR_DLAB) {</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span>      </div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span>        <span class="comment">// Divisor Latch LSB Register (DLL)</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span>        m_DLL = value;</div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span>        setBaud();</div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span>        </div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span>      </div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span>        <span class="comment">// Transmitter Holding Register (THR)</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span>        </div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>        printf(<span class="stringliteral">&quot;WR THR = %02X &quot;</span>, value);</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span>        </div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span>        <span class="keywordflow">if</span> (m_MCR &amp; PC8250_MCR_LOOPBACK) {</div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span>          <span class="comment">// loopback mode</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span>          </div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="preprocessor">          #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span>          printf(<span class="stringliteral">&quot;  loopback &quot;</span>);</div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span><span class="preprocessor">          #endif</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span>          </div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span>          m_THR = value;</div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span>          <span class="keywordflow">if</span> (m_LSR &amp; PC8250_LSR_DR) {</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span>          </div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span><span class="preprocessor">            #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span>            printf(<span class="stringliteral">&quot;  overrun &quot;</span>);</div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span><span class="preprocessor">            #endif</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span>            </div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span>            m_overrun = <span class="keyword">true</span>;</div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span>            </div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span>          }</div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>          m_LSR   |= PC8250_LSR_DR;                <span class="comment">// set DR flag</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span>          m_trigs |= m_IER &amp; PC8250_IER_RX_INT;    <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>        } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span>          <span class="comment">// normal mode</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span>          m_serialPort-&gt;send(value);</div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span>        }</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span>        </div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span>        printf(<span class="stringliteral">&quot;\n&quot;</span>);</div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span>        </div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span>        m_trigs &amp;= ~PC8250_IER_TX_INT;         <span class="comment">// reset interrupt triggered flag</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span>        m_IIR    = 1;</div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span>        m_trigs |= m_IER &amp; PC8250_IER_TX_INT;  <span class="comment">// set interrupt triggered flag (of interrupt enabled)</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span>        </div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span>      }</div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span>      </div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span>    <span class="comment">// DLAB = 0 : Interrupt Enable Register (IER)</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>    <span class="comment">// DLAB = 1 : Divisor Latch MSB Register (DLM)</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span>    <span class="keywordflow">case</span> 1:</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span>      <span class="keywordflow">if</span> (m_LCR &amp; PC8250_LCR_DLAB) {</div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span>        <span class="comment">// Divisor Latch MSB Register (DLM)</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span>        m_DLM = value;</div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span>        setBaud();</div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span>        <span class="comment">// Interrupt Enable Register (IER)</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span>        m_IER = value &amp; 0x0f;</div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span>        m_trigs |= m_IER &amp; PC8250_IER_TX_INT;</div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span>        </div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span>        printf(<span class="stringliteral">&quot;WR IER = %02X (%d ms)\n&quot;</span>, value, (<span class="keywordtype">int</span>)esp_timer_get_time()/1000);</div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span>      }</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span>      </div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span>    <span class="keywordflow">case</span> 2:</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span>      printf(<span class="stringliteral">&quot;WR IIR - UNSUPPORTED\n&quot;</span>);</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span>      </div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span>    <span class="comment">// Line Control Register (LCR)</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span>    <span class="keywordflow">case</span> 3:</div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span>      <span class="keywordflow">if</span> ((m_LCR &amp; PC8250_LCR_SENDBREAK) != (value &amp; PC8250_LCR_SENDBREAK)) {</div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span>        <span class="comment">// send break changed</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span>        <span class="keywordflow">if</span> (m_MCR &amp; PC8250_MCR_LOOPBACK) {</div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span>          <span class="keywordflow">if</span> (value &amp; PC8250_LCR_SENDBREAK) {</div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span>            m_LSR   |= PC8250_LSR_BI | PC8250_LSR_DR;</div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span>            m_trigs |= m_IER &amp; PC8250_IER_LINE_INT;</div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span>            m_THR    = 0;</div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span>          }</div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span>        } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span>          m_serialPort-&gt;sendBreak(value &amp; PC8250_LCR_SENDBREAK);</div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span>        }</div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span>      }</div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span>      m_LCR = value;</div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span>      setFrame();</div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span>      </div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span>      printf(<span class="stringliteral">&quot;WR LCR = %02X (%d ms)\n&quot;</span>, value, (<span class="keywordtype">int</span>)esp_timer_get_time()/1000);</div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span>      <span class="keywordflow">if</span> (m_LCR &amp; PC8250_LCR_SENDBREAK) printf(<span class="stringliteral">&quot;  SEND BREAK\n&quot;</span>);</div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span>      </div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span>      </div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span>    <span class="comment">// MODEM Control Register (MCR)</span></div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>    <span class="keywordflow">case</span> 4:</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>      m_MCR = value &amp; 0x1f;</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>      <span class="keywordflow">if</span> (m_MCR &amp; PC8250_MCR_LOOPBACK) {</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span>        checkCTSChanged();</div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>        checkDSRChanged();</div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span>        checkRIChangeLow();</div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span>        checkDCDChanged();</div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span>      } <span class="keywordflow">else</span> {</div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span>        m_serialPort-&gt;setDTRStatus(m_MCR &amp; PC8250_MCR_DTR);</div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span>        m_serialPort-&gt;setRTSStatus(m_MCR &amp; PC8250_MCR_RTS);</div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span>      }</div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span>      </div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span>      printf(<span class="stringliteral">&quot;WR MCR = %02X (%s %s %s %s %s)\n&quot;</span>, value, value &amp; PC8250_MCR_DTR ? <span class="stringliteral">&quot;DTR&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MCR_RTS ? <span class="stringliteral">&quot;RTS&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MCR_OUT1 ? <span class="stringliteral">&quot;OUT1(RI)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MCR_OUT2 ? <span class="stringliteral">&quot;OUT2(DCD)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MCR_LOOPBACK ? <span class="stringliteral">&quot;LOOPBACK&quot;</span> : <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span>      </div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span>      </div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span>    <span class="keywordflow">case</span> 5:</div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span>      printf(<span class="stringliteral">&quot;WR LSR - NOT SUPPORTED\n&quot;</span>);</div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span>    </div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span>    <span class="comment">// MODEM Status Register (MSR)</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span>    <span class="keywordflow">case</span> 6:</div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span>      printf(<span class="stringliteral">&quot;WR MSR = %02X (%s %s %s %s %s %s %s %s)\n&quot;</span>, value, value &amp; PC8250_MSR_DCTS ? <span class="stringliteral">&quot;DCTS&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MSR_DDSR ? <span class="stringliteral">&quot;DDSR&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MSR_TERI ? <span class="stringliteral">&quot;TERI&quot;</span> : <span class="stringliteral">&quot;&quot;</span>,value &amp; PC8250_MSR_DDCD ? <span class="stringliteral">&quot;DDCD&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MSR_CTS ? <span class="stringliteral">&quot;CTS&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MSR_DSR ? <span class="stringliteral">&quot;DSR&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MSR_RI ? <span class="stringliteral">&quot;RI(OUT1)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>, value &amp; PC8250_MSR_DCD ? <span class="stringliteral">&quot;DCD(OUT2)&quot;</span> : <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span>      </div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span>      m_MSR = (m_MSR &amp; 0xf0) | (value &amp; 0x0f);</div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span>      <span class="keywordflow">if</span> (m_MSR &amp; 0x0f)</div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span>        m_trigs |= m_IER &amp; PC8250_IER_MODEM_INT;</div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span>      </div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span>    <span class="comment">// Scratch Register</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span>    <span class="keywordflow">case</span> 7:</div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span>      m_SCR = value;</div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span>      </div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span><span class="preprocessor">      #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span>      printf(<span class="stringliteral">&quot;WR SCR = %02X\n&quot;</span>, value);</div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span><span class="preprocessor">      #endif</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno">  439</span>      </div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span>      <span class="keywordflow">break</span>;</div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span>  </div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span>  }</div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span>}</div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span> </div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span> </div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span><span class="keywordtype">void</span> PC8250::setBaud()</div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span>{</div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno">  448</span>  <span class="keywordtype">int</span> div  = m_DLL | ((int)m_DLM &lt;&lt; 8);</div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span>  <span class="keywordtype">int</span> baud = m_freq / 16 / (div ? div : 1);</div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span>  m_serialPort-&gt;setBaud(baud);</div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span>  </div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span><span class="preprocessor">  #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno">  453</span>  printf(<span class="stringliteral">&quot;BAUD = %d\n&quot;</span>, baud);</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span><span class="preprocessor">  #endif</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span>}</div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno">  456</span> </div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span> </div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span><span class="keywordtype">void</span> PC8250::setFrame()</div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span>{</div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span>  <span class="keywordtype">int</span> dataLength = (m_LCR &amp; 0b11) + 5;</div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span>  <span class="keywordtype">char</span> parity    = m_LCR &amp; PC8250_LCR_PARITYEN ? (m_LCR &amp; PC8250_LCR_PARITYEVEN ? <span class="charliteral">&#39;E&#39;</span> : <span class="charliteral">&#39;O&#39;</span>) : <span class="charliteral">&#39;N&#39;</span>;</div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span>  <span class="keywordtype">float</span> stopBits = m_LCR &amp; PC8250_LCR_MBITSTOP ? (dataLength == 5 ? 1.5 : 2) : 1;</div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span>  m_serialPort-&gt;setFrame(dataLength, parity, stopBits);</div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span>}</div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span> </div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span> </div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span><span class="keywordtype">bool</span> PC8250::getOut1()</div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span>{</div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span>  <span class="keywordflow">return</span> m_MCR &amp; PC8250_MCR_OUT1;</div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span>}</div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span> </div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span> </div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span><span class="keywordtype">bool</span> PC8250::getOut2()</div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span>{</div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span>  <span class="keywordflow">return</span> m_MCR &amp; PC8250_MCR_OUT2;</div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span>}</div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span> </div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span> </div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span><span class="keywordtype">void</span> PC8250::checkOverflowError()</div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span>{</div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span>  <span class="keywordflow">if</span> (m_serialPort-&gt;overflowError() || m_overrun) {</div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span>    m_overrun  = <span class="keyword">false</span>;</div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span>    m_LSR     |= PC8250_LSR_OE;                <span class="comment">// set OE flag</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span>    m_trigs   |= m_IER &amp; PC8250_IER_LINE_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span>  }</div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span>}</div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span> </div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span> </div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span><span class="keywordtype">void</span> PC8250::checkParityError()</div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span>{</div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span>  <span class="keywordflow">if</span> (m_serialPort-&gt;parityError()) {</div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span>    m_LSR   |= PC8250_LSR_PE;                <span class="comment">// set PE flag</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span>    m_trigs |= m_IER &amp; PC8250_IER_LINE_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span>  }</div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span>}</div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span> </div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span> </div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span><span class="keywordtype">void</span> PC8250::checkFramingError()</div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span>{</div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span>  <span class="keywordflow">if</span> (m_serialPort-&gt;framingError()) {</div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span>    m_LSR   |= PC8250_LSR_FE;                <span class="comment">// set FE flag</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span>    m_trigs |= m_IER &amp; PC8250_IER_LINE_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span>  }</div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span>}</div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span> </div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span> </div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span><span class="keywordtype">void</span> PC8250::checkBreakDetected()</div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span>{</div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span>  <span class="keywordflow">if</span> (m_serialPort-&gt;breakDetected()) {</div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span>    m_LSR   |= PC8250_LSR_BI | PC8250_LSR_DR;</div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span>    m_trigs |= m_IER &amp; PC8250_IER_LINE_INT;</div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span>    m_THR    = 0;</div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span>  }</div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span>}</div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span> </div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span> </div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno">  517</span><span class="keywordtype">void</span> PC8250::checkByteReceived()</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span>{</div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span>  <span class="keywordflow">if</span> (m_dataReady &amp;&amp; (m_MCR &amp; PC8250_MCR_LOOPBACK) == 0) {</div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span>    m_LSR   |= PC8250_LSR_DR;                <span class="comment">// set DR flag</span></div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span>    m_trigs |= m_IER &amp; PC8250_IER_RX_INT;    <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span>  }</div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span>}</div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span> </div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno">  525</span> </div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span><span class="keywordtype">void</span> PC8250::checkCTSChanged()</div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span>{</div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span>  <span class="keywordtype">bool</span> value = m_MCR &amp; PC8250_MCR_LOOPBACK ? m_MCR &amp; PC8250_MCR_RTS : m_serialPort-&gt;CTSStatus();</div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span>  <span class="keywordflow">if</span> ((<span class="keywordtype">bool</span>)(m_MSR &amp; PC8250_MSR_CTS) != value) {</div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span>    m_MSR   ^= PC8250_MSR_CTS;                <span class="comment">// invert CTS</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span>    m_MSR   |= PC8250_MSR_DCTS;               <span class="comment">// set DCTS</span></div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span>    m_trigs |= m_IER &amp; PC8250_IER_MODEM_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span>  }</div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno">  534</span>}</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span> </div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span> </div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span><span class="keywordtype">void</span> PC8250::checkDSRChanged()</div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span>{</div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span>  <span class="keywordtype">bool</span> value = m_MCR &amp; PC8250_MCR_LOOPBACK ? m_MCR &amp; PC8250_MCR_DTR : m_serialPort-&gt;DSRStatus();</div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span>  <span class="keywordflow">if</span> ((<span class="keywordtype">bool</span>)(m_MSR &amp; PC8250_MSR_DSR) != value) {</div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span>    m_MSR   ^= PC8250_MSR_DSR;                <span class="comment">// invert DSR</span></div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span>    m_MSR   |= PC8250_MSR_DDSR;               <span class="comment">// set DDSR</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span>    m_trigs |= m_IER &amp; PC8250_IER_MODEM_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span>  }</div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno">  545</span>}</div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span> </div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span> </div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno">  548</span><span class="keywordtype">void</span> PC8250::checkRIChangeLow()</div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span>{</div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span>  <span class="keywordtype">bool</span> value = m_MCR &amp; PC8250_MCR_LOOPBACK ? m_MCR &amp; PC8250_MCR_OUT1 : m_serialPort-&gt;RIStatus();</div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span>  <span class="keywordflow">if</span> ((<span class="keywordtype">bool</span>)(m_MSR &amp; PC8250_MSR_RI) != value &amp;&amp; !value) {</div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span>    m_MSR   &amp;= ~PC8250_MSR_RI;                <span class="comment">// reset RI</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno">  553</span>    m_MSR   |= PC8250_MSR_TERI;               <span class="comment">// set TERI</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span>    m_trigs |= m_IER &amp; PC8250_IER_MODEM_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span>  }</div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span>  m_MSR = (m_MSR &amp; ~PC8250_MSR_RI) | (value ? PC8250_MSR_RI : 0);</div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span>}</div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span> </div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span> </div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span><span class="keywordtype">void</span> PC8250::checkDCDChanged()</div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span>{</div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span>  <span class="keywordtype">bool</span> value = m_MCR &amp; PC8250_MCR_LOOPBACK ? m_MCR &amp; PC8250_MCR_OUT2 : m_serialPort-&gt;DCDStatus();</div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span>  <span class="keywordflow">if</span> ((<span class="keywordtype">bool</span>)(m_MSR &amp; PC8250_MSR_DCD) != value) {</div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span>    m_MSR   ^= PC8250_MSR_DCD;                <span class="comment">// invert DCD</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span>    m_MSR   |= PC8250_MSR_DDCD;               <span class="comment">// set DDCD</span></div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span>    m_trigs |= m_IER &amp; PC8250_IER_MODEM_INT;  <span class="comment">// set int triggered flag</span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span>  }</div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno">  568</span>}</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno">  569</span> </div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span> </div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span><span class="keywordtype">void</span> PC8250::tick()</div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span>{</div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span>  <span class="comment">// check for interrupts?</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span>  <span class="keywordflow">if</span> (m_IER) {</div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno">  575</span>  </div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span>    <span class="comment">// check for received byte interrupt?</span></div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span>    <span class="keywordflow">if</span> (m_IER &amp; PC8250_IER_RX_INT)</div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span>      checkByteReceived();</div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span> </div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno">  580</span>    <span class="comment">// check for line status error or break interrupt?</span></div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span>    <span class="keywordflow">if</span> (m_IER &amp; PC8250_IER_LINE_INT) {</div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span>      checkOverflowError();</div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span>      checkParityError();</div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span>      checkFramingError();</div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span>      checkBreakDetected();</div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span>    }</div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span>    </div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno">  588</span>    <span class="comment">// check for MODEM changes interrupt?</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno">  589</span>    <span class="keywordflow">if</span> ((m_IER &amp; PC8250_IER_MODEM_INT) &amp;&amp; !(m_MCR &amp; PC8250_MCR_LOOPBACK)) {</div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span>      checkCTSChanged();</div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span>      checkDSRChanged();</div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span>      checkRIChangeLow();</div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span>      checkDCDChanged();</div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno">  594</span>    }</div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span> </div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno">  596</span>    <span class="comment">// set INTR pin? (callback)</span></div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span>    <span class="keywordflow">if</span> (m_trigs &amp;&amp; (m_LCR &amp; PC8250_LCR_DLAB) == 0) {</div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span>      <span class="keywordflow">if</span> (m_interruptCallback(<span class="keyword">this</span>, m_context)) {</div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span><span class="preprocessor">        #if PC8250_DEBUG</span></div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno">  600</span>        printf(<span class="stringliteral">&quot;INTR\n&quot;</span>);</div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno">  601</span><span class="preprocessor">        #endif</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno">  602</span>      }</div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno">  603</span>    }</div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno">  604</span>      </div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno">  605</span>  }</div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno">  606</span>}</div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno">  607</span> </div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno">  608</span> </div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno">  609</span> </div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno">  610</span> </div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno">  611</span>};  <span class="comment">// fabgl namespace</span></div>
<div class="ttc" id="a_p_c8250_8h_html"><div class="ttname"><a href="_p_c8250_8h.html">PC8250.h</a></div><div class="ttdoc">This file contains fabgl::PC8250 definition.</div></div>
<div class="ttc" id="agroup___enumerations_gae88006c219f95bae663fe0f2a2561dd7_html_ggae88006c219f95bae663fe0f2a2561dd7a6adf97f83acf6453d4a6a4b1070f3754"><div class="ttname"><a href="group___enumerations_gae88006c219f95bae663fe0f2a2561dd7.html#ggae88006c219f95bae663fe0f2a2561dd7a6adf97f83acf6453d4a6a4b1070f3754">fabgl::FlowControl::None</a></div><div class="ttdeci">@ None</div></div>
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